The Snowy Mountain Rifle Company M5 AICS bottom metal and magazine kit is the perfect combination when looking for a lightweight magazine system with a bottom metal that can also accept a variety of AICS sized magazines. Every magazine kit includes an aluminum M5 AICS bottom metal and one magazine. Additional magazines are available for purchase separately. How to choose your kit: Selecting between the Standard and Magnum kits is a matter of determining your preferred caliber family. The Standard kit includes a magazine tailored for .308 Win/Creedmoor, compatible with standard bolt face short action calibers. Meanwhile, the Magnum kit features a magazine designed for WSM, SAUM, and PRC calibers.